Probably hard coded... it's behaviour is not of a random error introduced into the range reading, but rather of a "rounding off" of the range number. For example, if the target is 145 meters away, the watch officer will say 100 meters. If it's at 85, hil still say it's 100 meters... In esence, if the guy says that the range is X meters, it might actualy be anywhere in the interval (X-50, X+50].
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